Police, ambulance crews and the fire service were called to a medical emergency in Bury St Edmunds.
All three primary emergency services attended the scene in Out Risbygate on Wednesday morning.
It is understood the alarm was raised after a man was thought not to be breathing.
A male patient was treated a the scene before being taken to hospital, said the ambulance service.
Paramedics were called just after 11am, followed by police and a fire crew from Bury St Edmunds station.
A spokesman for the East of England Ambulance Service NHS Trust said: "We were called to Out Risbygate in Bury St Edmunds shortly after 11am to reports of a medical emergency.
"A rapid response vehicle, ambulance officer, ambulance and a crew from Suffolk Accident Rescue Service attended and treated a male patient at the scene before transporting him to West Suffolk Hospital for further assessment and care."
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